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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8bb0fa56d1436a6df45add05c8bcd51ff5bcd2674bfb9e00d635c481c3654df' 
  AND token = 'WGXoXEhAYZdzFG+CWrzO8koiuEeo12Q6+IxveHP3pFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}